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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkCanvas.h"
#include "SkComposeShader.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkShader.h"
#include "SkString.h"
#include "SkXfermode.h"
static SkShader* make_shader(SkXfermode::Mode mode) {
SkPoint pts[2];
SkColor colors[2];
pts[0].set(0, 0);
pts[1].set(SkIntToScalar(100), 0);
colors[0] = SK_ColorRED;
colors[1] = SK_ColorBLUE;
SkAutoTUnref<SkShader> shaderA(SkGradientShader::CreateLinear(pts, colors, NULL, 2,
SkShader::kClamp_TileMode));
pts[0].set(0, 0);
pts[1].set(0, SkIntToScalar(100));
colors[0] = SK_ColorBLACK;
colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
SkAutoTUnref<SkShader> shaderB(SkGradientShader::CreateLinear(pts, colors, NULL, 2,
SkShader::kClamp_TileMode));
SkAutoTUnref<SkXfermode> xfer(SkXfermode::Create(mode));
return SkNEW_ARGS(SkComposeShader, (shaderA, shaderB, xfer));
}
class ComposeShaderGM : public skiagm::GM {
public:
ComposeShaderGM() {
fShader = make_shader(SkXfermode::kDstIn_Mode);
}
virtual ~ComposeShaderGM() {
SkSafeUnref(fShader);
}
protected:
virtual uint32_t onGetFlags() const SK_OVERRIDE {
return kSkipTiled_Flag;
}
virtual SkString onShortName() SK_OVERRIDE {
return SkString("composeshader");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(120, 120);
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkPaint paint;
paint.setColor(SK_ColorGREEN);
canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
paint.setShader(fShader);
canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
}
protected:
SkShader* fShader;
private:
typedef GM INHERITED ;
};
class ComposeShaderAlphaGM : public skiagm::GM {
public:
ComposeShaderAlphaGM() {}
protected:
virtual SkString onShortName() SK_OVERRIDE {
return SkString("composeshader_alpha");
}
virtual SkISize onISize() SK_OVERRIDE {
return SkISize::Make(220, 750);
}
virtual uint32_t onGetFlags() const SK_OVERRIDE {
// we're only off by 1 bit per-component
return kSkipTiled_Flag;
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkAutoTUnref<SkShader> shader0(make_shader(SkXfermode::kDstIn_Mode));
SkAutoTUnref<SkShader> shader1(make_shader(SkXfermode::kSrcOver_Mode));
SkShader* shaders[] = { shader0.get(), shader1.get() };
SkPaint paint;
paint.setColor(SK_ColorGREEN);
const SkRect r = SkRect::MakeXYWH(5, 5, 100, 100);
for (size_t y = 0; y < SK_ARRAY_COUNT(shaders); ++y) {
SkShader* shader = shaders[y];
canvas->save();
for (int alpha = 0xFF; alpha > 0; alpha -= 0x28) {
paint.setAlpha(0xFF);
paint.setShader(NULL);
canvas->drawRect(r, paint);
paint.setAlpha(alpha);
paint.setShader(shader);
canvas->drawRect(r, paint);
canvas->translate(r.width() + 5, 0);
}
canvas->restore();
canvas->translate(0, r.height() + 5);
}
}
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new ComposeShaderGM; )
DEF_GM( return new ComposeShaderAlphaGM; )
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